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利用金属原位分析仪定量分析了过程Al系夹杂的数量,并用一种深度侵蚀的方法观察了夹杂物的三维真实形貌.对过程全氧(T.O)、[N]含量变化进行了跟踪.通过延长RH合金化后的纯循环时间对过程洁净度进行了评价.结果表明:RH在合金化后保持8～10 min的纯循环时间T.O可降低到30×10-6以下;废钢加入会极大影响钢液的洁净度,合金化完毕后应避免废钢加入;加Al 5min后夹杂物数量达到最大,为7.02mm-2,主要为大型的团簇状夹杂,经过纯循环后,夹杂物数量、尺寸均有较大的降低.
The amount of Al inclusions in the process was quantitatively analyzed by metal in-situ analyzer, and the true three-dimensional morphology of the inclusions was observed by a deep erosion method. The change of total oxygen (TO) and [N] content in the process was tracked. The process cleanliness was evaluated by prolonging the pure cycle time after RH alloying.The results show that the pure cycle time (TO) of RH after alloying for 8 ~ 10 min can be reduced below 30 × 10-6, Greatly affect the cleanliness of the molten steel, after the alloying should avoid scrap joining; plus Al 5min after the largest number of inclusions, 7.02mm-2, mainly for large cluster inclusions, after pure circulation, the number of inclusions , The size has a greater reduction.